Narration or not, it still sounds wrong to me; "after given" as a phrase doesn't make sense. Perhaps the narrator spoke too quickly or accidentally swallowed a "they're", as in: After [they're] given the chicken feed, the crickets become big and strong.
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Amos M. CarpenterApr 10 '12 at 11:35

While you have probably corrected it to what OP is trying to say, it's worth noting that the sentence he thought was correct isn't necessarily incorrect. This technique is often used, perhaps most notably in some styles of narration.
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zpletanApr 9 '12 at 22:44

yes, You are correct. I can very clearly hear a voice-over narrator in a documentary saying that sentence.
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JimApr 9 '12 at 22:49

@Jim - Does this 'being' grammatically similar to the 'being' in this phrase: 'for the time being'?
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user19148Apr 9 '12 at 23:00

2

Indeed, this is a voice-over in a documentary!
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IVYApr 9 '12 at 23:19

If the meaning of the sentence is that the crickets ate chicken feed, I guess that the most correct way of saying it is "after being given... "; I think you could also say "after having been given chicken feed", which however sounds unnecessarily complicated.